Yes, I still use spacebar to scroll, and feel frustrated when on some websites it is broken. Why is that?<p>* Is it responsive website design in CSS?<p>(i use FF20)
Because some people don't use the spacebar for themselves, or use a browser that doesn't support spacebar page-down scrolling, and think shortcuts are smart. For them it's OK to experiment and remap a key to some feature, even though only them are aware of it, and most other people won't see it and won't use it, or will get bitten as you are.<p>Tumblr is a a particular nest of this kind of websites.<p>That's unfortunate, and funny at the same time. Internet is also a playground, a sand box, a place to learn.<p>Best you can do is contact them, and teach them a polite UX lesson.